As I'm leaving my teenage years behind me forever 2 weeks from now, this is an interesting question. To me, teens may be the least understood and least guided age group. I'm sure this is largely owed to the fact that many teens don't really want to be guided and understood, or at least they tend to get pissed off when people try and fail to understand them.
It seems difficult, since teenagers can't fully relate to anyone older or younger, since they're kind of in between. The only ones they can count on for support are each other, but the types of attitudes which are often fostered during the teen years are often cruel and competitive, so for some it can be hard to count on anyone. I know I felt pretty alone throughout most of my teen-hood. My dad died when I was 14, so I was basically going through grief and puberty at the same time. On top of that, I moved to a new city & school. I feel like I would have been receptive to support, and in fact I think I did seek it out, but never seem to find what I was looking for. But I got through it, and I feel much better now, but not all do. I think there must be ways our society can improve helping confused and troubled teens, the seeds of several social problems are planted in these years, and I'm not really sure, but I would guess that suicide rates are higher at these ages.